Deuteronomy 25:5

'When brethren dwell together, and one of them hath died, and hath no son, the wife of the dead is not without to a strange man; her husband's brother doth go in unto her, and hath taken her to him for a wife, and doth perform the duty of her husband's brother;

Matthew 22:24

'Teacher, Moses said, If any one may die not having children, his brother shall marry his wife, and shall raise up seed to his brother.

Mark 12:19

'Teacher, Moses wrote to us, that if any one's brother may die, and may leave a wife, and may leave no children, that his brother may take his wife, and raise up seed to his brother.

Luke 20:28

saying, 'Teacher, Moses wrote to us, If any one's brother may die, having a wife, and he may die childless -- that his brother may take the wife, and may raise up seed to his brother.

Genesis 38:8-9

And Judah saith to Onan, 'Go in unto the wife of thy brother, and marry her, and raise up seed to thy brother;'

Ruth 1:12-13

Turn back, my daughters, go, for I am too aged to be to a husband; though I had said, There is for me hope, also, I have been to-night to a husband, and also I have borne sons:

Ruth 3:9

And he saith, 'Who art thou?' and she saith, 'I am Ruth thy handmaid, and thou hast spread thy skirt over thy handmaid, for thou art a redeemer.'

Ruth 4:5

And Boaz saith, 'In the day of thy buying the field from the hand of Naomi, then from Ruth the Moabitess, wife of the dead, thou hast bought it, to raise up the name of the dead over his inheritance.'

Treasury of Scripture Knowledge

Summary

If brethren dwell together, and one of them die, and have no child, the wife of the dead shall not marry without unto a stranger: her husband's brother shall go in unto her, and take her to him to wife, and perform the duty of an husband's brother unto her.

Bible References

Brethren

Matthew 22:24
'Teacher, Moses said, If any one may die not having children, his brother shall marry his wife, and shall raise up seed to his brother.
Mark 12:19
'Teacher, Moses wrote to us, that if any one's brother may die, and may leave a wife, and may leave no children, that his brother may take his wife, and raise up seed to his brother.
Luke 20:28
saying, 'Teacher, Moses wrote to us, If any one's brother may die, having a wife, and he may die childless -- that his brother may take the wife, and may raise up seed to his brother.

Husband's brother

Genesis 38:8
And Judah saith to Onan, 'Go in unto the wife of thy brother, and marry her, and raise up seed to thy brother;'
Ruth 1:12
Turn back, my daughters, go, for I am too aged to be to a husband; though I had said, There is for me hope, also, I have been to-night to a husband, and also I have borne sons:
Ruth 3:9
And he saith, 'Who art thou?' and she saith, 'I am Ruth thy handmaid, and thou hast spread thy skirt over thy handmaid, for thou art a redeemer.'
Ruth 4:5
And Boaz saith, 'In the day of thy buying the field from the hand of Naomi, then from Ruth the Moabitess, wife of the dead, thou hast bought it, to raise up the name of the dead over his inheritance.'

General references

Genesis 38:8
And Judah saith to Onan, 'Go in unto the wife of thy brother, and marry her, and raise up seed to thy brother;'
Leviticus 18:16
The nakedness of thy brother's wife thou dost not uncover; it is thy brother's nakedness.
Matthew 14:4
for John was saying to him, 'It is not lawful to thee to have her,'
Luke 20:28
saying, 'Teacher, Moses wrote to us, If any one's brother may die, having a wife, and he may die childless -- that his brother may take the wife, and may raise up seed to his brother.